// Global variable .....................................................
  var icon   = new Array();
  var iconid = new Array();
  
  // IconPreLoad() : Loading interactive icon image ......................
  function IconPreLoad( id, src ) {
    var n = iconid.length;
    iconid[n] = id;
    icon[n] = new Array();
    icon[n][0] = new Image();
    icon[n][0].src = src + ".gif";
    icon[n][1] = new Image();
    icon[n][1].src = src + "_ovr.gif";
  }
  
  // IconStat() : Switching interactive icon data ........................
  function IconStat( id, mode ) {
    var n = iconid.length;
    var i;
    
    for( i=0; i<n; i++ ) {
      if( id == iconid[i] )
        break;
    }
    if( i < n )
      document.images[id].src = icon[i][mode].src;
  }